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Identifier |
000427560 |
Title |
Bunch characteristics evolution for lepton and hadron rings under the influence of the Intra-beam scattering effect |
Alternative Title |
Εξέλιξη χαρακτηριστικών δέσμης σωματιδίων σε επιταχυντικούς δακτυλίους λεπτονίων και αδρονίων υπό την επίδραση του φαινομένου ενδο-δεσμικής σκέδασης |
Author
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Παπαδοπούλου, Παρθένα-Στεφανία Γ.
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Thesis advisor
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Τομαράς, Θεόδωρος
Παπαφιλίππου, Ιωάννης
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Reviewer
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Τσιρώνης, Γεώργιος
Κομίνης, Ιωάννης
Μακρής, Κωνσταντίνος
Παυλίδου, Βασιλική
Τσάμης, Νικόλαος
|
Abstract |
The physical parameter quantifying particle events' production and thereby the performance of a collider is
the luminosity. High luminosities are reached by increasing the beam brightness, i.e. the intensity on a
specific phase space volume (emittance). In this respect, the luminosity of hadron and lepton rings is limited
by a combination of collective effects causing particle losses and emittance growth. In particular, Intra-beam
scattering (IBS) impacts beam quality, through emittance growth. Several IBS theoretical models and their
approximations exist, all assuming Gaussian beams. This thesis elaborates the optimization of the lattice
design for a lepton ring and the study of the bunch characteristics evolution for a hadron ring, under the
influence of IBS. Taking into account IBS, based on analytical results and numerical simulations, the optics
design optimization is presented for the damping rings (DRs) of the Compact Linear Collider (CLIC).
Specifically, aiming to reduce the betatron emittance of the DRs, dipoles whose magnetic field varies
longitudinally are used together with high-field SC wigglers. Based on measurements and Monte-Carlo
simulations, the interplay between IBS and radiation effects is also studied for the Large Hadron Collider
(LHC), in view of understanding the bunch parameters evolution that determine the delivered luminosity.
For the LHC bunch profiles which are observed to be non-Gaussian along the LHC energy cycle, appropriate
fitting functions are used in order to describe accurately the distributions. In addition, the impact of the
non-Gaussian distributions on the estimation of the beam size and thus, of the luminosity is studied. The
importance to develop analytical formulas and simulation tools that calculate IBS for any distribution is
underlined.
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Language |
English |
Subject |
Accelerator physics |
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Beams |
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CLIC |
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Cern |
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LHC |
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Δέσμη σωματιδίων |
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Επιταχυντές |
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Φυσική επιταχυντών |
Issue date |
2020-01-20 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Doctoral theses
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Type of Work--Doctoral theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/1/f/8/metadata-dlib-1579510265-240445-14668.tkl
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Views |
781 |